[Uri-review] xmp.did xmp.iid scheme registration
Larry Masinter <masinter@adobe.com> Wed, 18 October 2017 06:44 UTC
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From: Larry Masinter <masinter@adobe.com>
To: "uri-review@ietf.org" <uri-review@ietf.org>
Thread-Topic: xmp.did xmp.iid scheme registration
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Date: Wed, 18 Oct 2017 06:44:12 +0000
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Subject: [Uri-review] xmp.did xmp.iid scheme registration
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Should have done this 10 years ago. There are two schemes, with identical templates.
Scheme name:
xmp.iid
xmp.did
Status:
Provisional (?)
Applications/protocols that use this scheme name:
Many products from Adobe and others
Contact:
Larry Masinter <masinter@adobe.com<mailto:masinter@adobe.com>>
Change controller:
Adobe
References:
“Partner’s Guide to XMP for Dynamic Media”, 2008
https://wwwimages2.adobe.com/content/dam/Adobe/en/devnet/xmp/pdfs/DynamicMediaXMPPartnerGuide.pdf#page=19
page 19 (reproduced below)
Security Considerations
These identifiers are used in data
structures that track the provenance
of works. This information might
be considered private, but if stripped
the utility is reduced.
Identifier URI schemes
The following URI schemes are used in some versions of XMP software to ensure unambiguous ID
references:
➤ xmp.iid: Used for InstanceID
➤ xmp.did: Used for DocumentID
These have the same syntax as InstanceID and DocumentID; globally unique 128-bit numbers
encoded in hexadecimal. However, each is used only in the correct context. For example, the
following unambiguously refers to “a file that has this ID as its InstanceID in its XMP Packet”:
xmpMM:InstanceId="xmp.iid:b9db20421f30bb3fe10e5f90"
Similarly:
xmpMM:DocumentId="xmp.did:b9db20421f30bb3fe10e5f90"
xmpMM:OriginalDocumentId="xmp.did:b9db20421f30bb3fe10e5f90"
The xmp.iid and xmp.did URIs are used only for files that have XMP actually stored in the file, not in
sidecar files. Files that do not have embedded XMP still have InstanceID and DocumentID, but not in
this form. Some documents that do have embedded XMP might still have a DocumentID that does not
use xmp.did, because the document started out as a file without XMP but with some other kind of
unique document identifier.
These are URIs (that is, they uniformly identify resources), but they are only useful as URLs (Uniform
Resource Locators) if there is an index of files with XMP indexed by the IDs found within them. In the
case of xmp.did:, it might be necessary to examine modification dates and history to determine which
is the latest of multiple instances with the same document ID.
- [Uri-review] xmp.did xmp.iid scheme registration Larry Masinter